Salmon-noodle casserole

I based this on a tuna casserole recipe to create this. I think it turned out really good.

Salmon-noodle casserole (makes 4 large servings)
3 cups uncooked whole-grain rotini noodles
1 can condensed cream of mushroom soup

3/4 cup fat-free milk
6 ounces cooked salmon
1 cup steamed green beans, chopped (or you could use chopped bell pepper or shrooms)
1/4 cup chopped onion
1 cup chopped celery
2 tablespoons butter
salt and pepper, to taste

optional: 3-4 tablespoons shredded parmesan

1.) Heat the butter in a large pan and cook the celery and onion until soft, about 5 minutes. Add the soup and whisk.

2.) Add the pasta, salmon, and beans, and stir gently. Take off heat.

3.) Spread into a casserole dish. Sprinkle with parmesan.

4.) Cook at 350 for 30 minutes.